<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>自定义遍历数据</title>
</head>
<body>
  <script>
    //声明一个对象
    const banji = {
      name:"终极一班",
      stus:[
            'uzi',
            'ning',
            'tian',
            'knight'
      ],
      [Symbol.iterator](){
        //索引变量
        let index = 0;
        //
        let _this = this;
        return {
          next:function(){
            if(index < _this.stus.length){
              const result = { value : _this.stus[index], done : false}
            //下标自增
            index++;
            //返回结果
            return result;
            }else{
              return { value: undefined, done: true}
            }
          }
        }
      }
    }

    //遍历这个对象
    for(let v of banji){
      console.log(v);
    }
  </script>
</body>
</html>